red

Execute TDD Red Phase - write ONE failing test.

Command for Claude Code

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/christopher-buss/bedrock/red
Clone the repo
git clone --depth 1 https://github.com/christopher-buss/bedrock

Made for: Claude Code.

Per session 10 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 973 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 80% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00010 $0.00973
Opus 5 $0.00005 $0.00487
Sonnet 5 $0.00002 $0.00195
Haiku 4.5 $0.00001 $0.00097

Measured today against content hash dff5753194a0, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

red scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

80% identical to cycle — 133 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/commands/red.md · 100 lines

How it starts

The opening of the file, as written. The whole thing — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.

RED PHASE! Apply the below to the info given by user input here: $ARGUMENTS

(If there was no info above, fallback to the context of the conversation)

TDD Fundamentals

The TDD Cycle

The foundation of TDD is the Red-Green-Refactor cycle:

  1. Red Phase: Write ONE failing test that describes desired behavior

    • The test must fail for the RIGHT reason (not syntax/import errors)
    • Only one test at a time - this is critical for TDD discipline
      • Exception: For browser-level tests or expensive setup (e.g., Storybook *.stories.tsx), group multiple assertions within a single test block to avoid redundant setup - but only when adding assertions to an existing interaction flow. If new user interactions are required, still create a new test. Split files by category if they exceed ~1000 lines.
    • Adding a single test to a test file is ALWAYS allowed - no prior test output needed
    • Starting TDD for a new feature is always valid, even if test output shows unrelated work
    • Avoid hard-coded timeouts both in form of sleep() or timeout: 5000 etc; use proper async patterns (waitFor, findBy*, event-based sync) instead and rely on global test configs for timeout settings
  2. Green Phase: Write MINIMAL code to make the test pass

    • Implement only what's needed for the current failing test
    • No anticipatory coding or extra features
    • Address the specific failure message
  3. Refactor Phase: Improve code structure while keeping tests green

    • Only allowed when relevant tests are passing
    • Requires proof that tests have been run and are green
    • Applies to BOTH implementation and test code
    • No refactoring with failing tests - fix them first

Core Violations

  1. Multiple Test Addition

    • Adding more than one new test at once
    • Exception: Initial test file setup or extracting shared test utilities
  2. Over-Implementation

    • Code that exceeds what's needed to pass the current failing test
    • Adding untested features, methods, or error handling
    • Implementing multiple methods when test only requires one

Read the full file on GitHub · 100 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. today First seen · 100 lines · 10 tokens per session scan A dff5753194a0

Subscribe to this mod's changes

red is a command published in the GitHub repository christopher-buss/bedrock (13 stars, last pushed yesterday), licensed MIT. It adds 10 tokens to every session and 973 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 80% identical to cycle, differing in 133 lines, and is treated as a copy.